H.c. Starck Gmbh

H. C. Starck, Gmbh & Co Kg

Toda Kogyo Europe Gmbh

H.c. Starck Tungsten Gmbh

Bayer Aktiengesellschaft

Umicore

H. C. Starch Gmbh

H. C. Stack Gmbh & Co. Kg

Toda Kogyo Corporation

Michael Erb

Gerd Maikowske

Juliane Meese-marktscheffel

Armin Olbrich

Sven Albrecht

Viktor Stoller

Juliane Meese-Marktscheffel

Frank Schrumpf

Dirk Naumann

Gerhard Gille

Matthias Jahn

Stefan Malcus

Josef Schmoll

Rüdiger Zertani

Astrid Gorge

Wolfgang Mathy

Ulrich Krynitz

Michael Kruft

Astrid G&ouml;rge

Katrin Plaga

Anja Weiland

Frank Van Der Pütten

Juliane Messe-Marktscheffel

Wolfgang Wiezoreck

Trevor McLeod

Shuja Siddiqui

Rob Rops

Uwe Kutzler

Hirofumi Hori

Peter Axmann

Margret Wohlfahrt-Mehrens

Wolfgang Kummer

Wilfried Gutknecht

Bernd Mende

Martin Schloh

Ines Lamprecht

Astrid Görge

Herbert Dittrich

Sandra Ströbele

Julia Meese-marktscheffel

Tino Säuberlich

Tobias Schröer

Jürgen Müller

Ruediger Zertani

Mirja Sternberg

Petra Scholz

Dirk Paulmann

Henrik Trümpelmann

Michael Reiss

Gerd Malkowske

Michael Reiβ

Karl-Heinz Heine

Trevor Mcleod

Thomas Richter

Frank Van Der Putten

Rudiger Zertani

Josef (deceased) Schmoll

Juliane Meese-Martscheffel

The present invention relates to a process for preparing ammonium metatungstate using a reverse osmosis cell, and to a device for performing the process according to the invention.

Method for preparing ammonium metatungstate

The present invention relates to β-nickel hydroxide doped with aluminum ions, in which the aluminum ions are homogeneously distributed in the crystal lattice of the β-nickel hydroxide, as well as a method for their production. The present invention further relates to the use of the β-nickel hydroxide according to the invention as a precursor material for the production of electrode material for lithium-ion batteries and nickel-metal hydride batteries and as a precursor material in the production of Raney nickel catalysts.

Beta-nickel hydroxide doped with aluminum

The present invention relates to a method for producing hard materials that are coated with a cobalt hydroxide compound and to powders that comprise the coated hard material particles, and the use thereof.

Powder comprising coated hard material particles

The invention is directed to a process for preparing a pulverulent compound of the formula NiM1M2O(OH)where M1 is Fe, Co, Zn, Cu or mixtures thereof, M2 is Mn, Al, Cr, B, Mg, Ca, Sr, Ba, Si or mixtures thereof, having the following steps:

Powered compounds, method for the production thereof, and use thereof in lithium secondary batteries

The invention is directed to a pulverulent compound of the formula NiM1M2O(OH)where M1 is at least one element selected from the group consisting of Fe, Co, Zn, Cu and mixtures thereof, M2 is at least one element selected from the group consisting of Mn, Al, Cr, B, Mg, Ca, Sr, Ba, Si and mixtures thereof, 0.3&#x2266;a&#x2266;0.83, 0.1&#x2266;b&#x2266;0.5, 0.01&#x2266;c&#x2266;0.5, 0.01&#x2266;x&#x2266;0.99 and 1.01&#x2266;y&#x2266;1.99, wherein the ratio of tapped density measured in accordance with ASTM B 527 to the D50 of the particle size distribution measured in accordance with ASTM B 822 is at least 0.2 g/cm&#xb7;&#x3bc;m. The invention is also directed to a method for the production of the pulverulent compound and the use as a precursor material for producing lithium compounds for use in lithium secondary batteries.

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A process for preparing a pure ammonium perrhenate includes producing a first aqueous suspension containing an ammonium perrhenate. A stoichiometric amount of a nitric acid is added to the first aqueous suspension so as to produce a second suspension. The second suspension is introduced into a cathode space of an electrolysis cell. The electrolysis cell is divided by a cation-exchange membrane into the cathode space and an anode space. The nitric acid is cathodically reduced to a nitrous acid in the cathode space by applying an electric potential. The nitrous acid is reacted with ammonium ions of the ammonium perrhenate so as to form an aqueous perrhenic acid. Potassium ions are removed from the aqueous perrhenic acid. At least a stoichiometric amount of ammonia is added to the aqueous perrhenic acid so as to produce the pure ammonium perrhenate.

Process for producing pure ammonium perrhenate

The present invention relates to pulverulent compounds of the formula NiM1M2(0)(OH)(SO), a process for the preparation thereof and the use thereof as precursors for the preparation of active materials for lithium secondary batteries.

Pulverulent compounds, processes for the preparation thereof and the use thereof in electrochemical applications

The invention relates to a powder compound of the formula NiMO(OH), wherein M represents Co and at least one element selected from the group consisting of Fe, Zn, Al, Sr, Mg, or Ca and mixtures thereof, or M represents Co Mn and Fe, wherein 0.6&#x2266;a&#x3c;1.0, 0&#x3c;b&#x2266;0.4, 0&#x3c;x&#x2266;0.60, and 1.4&#x2266;y&#x3c;2, wherein the powder compound has a particle size distribution dvalue, measured in accordance with ASTM B 822, of &#x3c;5 &#x3bc;m, and wherein a ratio of tap density, measured in accordance with ASTM B 527, to the particle size distribution dvalue is at least 0.4 g/cm. The invention also relates to a process for preparing the compound and its uses.

Process for the production of a powdered spherical tungstic acid by acidification of an aqueous alkaline tungstate solution with mineral acid at elevated temperature, preferably in a continuous stirred tank or a cascade of at least 2 continuous stirred tanks, and tungstic acid obtainable in this way, which is characterized by a high bulk density and spherical morphology.

Tungstic acid powder consisting of spherical tungsten particles and method for producing same

The present invention relates to a particulate mixed metal hydroxide that includes nickel, cobalt and aluminium. The powder particles have a core of nickel/cobalt hydroxide, and a surface that is coated with amorphous aluminium hydroxide. A process for the continuous preparation of such mixed metal hydroxides is also described. The process includes precipitating aluminium hydroxide in the presence of a nickel/cobalt mixed hydroxide in a tube reactor. The mixed metal hydroxides of the present invention may be used to prepare active materials for positive electrodes of a secondary battery.

Mixed metal hydroxides comprising amorphous aluminum hydroxide, and their preparation and use

Process for the electrochemical decomposition of precursors in powder form by introducing a powder batch between two electrodes of an electrolysis cell, electrodes being designed to be liquid-permeable, and the electrolyte flowing through the powder batch perpendicularly to the electrode surfaces, and electrolysis cell suitable therefor, which is essentially characterized in that at least one electrode has a structure which consists of a supporting pierced plate (), an electrode plate () provided with perforations, and a filter cloth () arranged between the supporting pierced plate () and the electrode plate (), and in that the cathode () is shielded from the cell by means of a liquid-permeable separator ().

Process for the electrochemical decomposition of powders and electrolysis cells suitable therefor

Composition comprising lithium compound and mixed metal hydroxides and their preparation and use

A process for preparing nickel hydroxide by alkaline precipitation from nickel salt solutions in the presence of complexing agents, in which the precipitation is carried out at at least two different locations in the same mother liquor with different precipitation kinetics at the different locations and the mother liquor is mixed prior to agglomeration of the precipitated primary crystals, is described.

Nickel hydroxide and method for producing same

A process for reducing the content of alkali metal impurities (e.g., potassium) in ammonium metallate solutions is described. The process involves subjecting a feed solution containing ammonium metallate and alkali metal impurities to membrane filtration. The membrane filtration results in the formation of a retentate having a reduced level alkali metal relative to the feed solution, and a permeate containing substantially the balance of alkali metal. The permeate may also be further treated, to remove alkali metal there from, by passage through a cation exchange column, thereby forming a cation exchange treated permeate that may be combined with the retentate of the membrane filtration step.

Purification of ammonium metallate solutions

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Seesen, Germany

Armin Olbrich